公开(公告)号：US20220109400A1

公开(公告)日：2022-04-07

申请号：US17553385

申请日：2021-12-16

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fei XU ,  Xinyu YU ,  Kai XIN ,  Jianqiang WANG

IPC: H02S40/32 ,  H02M7/537 ,  H02J3/38

Abstract: This application provides a converter and a power backfeed control method that are applied to a photovoltaic power generation system. One end of the converter is connected to at least one photovoltaic string, and another end of the converter is connected to a power grid. Each photovoltaic string corresponds to one string number. The power backfeed control method includes: controlling, according to a backfeed instruction, the converter to enter a backfeed mode, where in the backfeed mode, the converter can transmit energy of the power grid to a selected photovoltaic string with a corresponding number; determining a backfeed control voltage according to the backfeed instruction, and determining a voltage limit in a process of determining the backfeed control voltage; determining an actual backfeed voltage based on the backfeed control voltage and the voltage limit, where the actual backfeed voltage is a smaller one of the backfeed control voltage and the voltage limit; and controlling the converter to output the actual backfeed voltage to the selected photovoltaic string, to enable the selected photovoltaic string to generate an electroluminescent effect. This application can improve detection efficiency of the photovoltaic string, and reduce a power loss of the photovoltaic power generation system.

公开(公告)号：US20230291208A1

公开(公告)日：2023-09-14

申请号：US18316387

申请日：2023-05-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Jianqiang WANG ,  Song WAN

IPC: H02J3/46 ,  H02S50/10 ,  H02J3/00

CPC classification number: H02J3/46 ,  H02S50/10 ,  H02J3/0012 ,  H02J2300/26

Abstract: The photovoltaic power generation system includes a controller and M groups of DC-DC circuits. Each group of DC-DC circuits include N DC-DC circuits, where M is a positive integer, and N is an integer greater than 1. An input end of each DC-DC circuit is connected to at least one photovoltaic unit, and each photovoltaic unit includes at least one photovoltaic module. The controller controls the N DC-DC circuits in each group of DC-DC circuits to sequentially start online IV curve scanning and controls a time interval at which two adjacent DC-DC circuits start online IV curve scanning to be less than duration of online IV curve scanning performed by one DC-DC circuit. The photovoltaic power generation system can reduce a fluctuation of a power output during online IV curve scanning, reduce duration of online IV curve scanning performed by the photovoltaic power generation system.

公开(公告)号：US20240128793A1

公开(公告)日：2024-04-18

申请号：US18398782

申请日：2023-12-28

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yanzhong ZHANG ,  Zhenhuan SHU ,  Jianqiang WANG

IPC: H02J13/00 ,  H02J3/00

CPC classification number: H02J13/00034 ,  H02J3/0012 ,  H02J13/00001 ,  H02J13/00002 ,  H02J2203/10 ,  H02J2203/20 ,  H02J2300/24

Abstract: A data processing system in the power station operation and maintenance system may determine a faulty module and a normal module based on module data of each photovoltaic module in a photovoltaic string, and obtain first power generation data of the faulty module and second power generation data of the normal module. Further, the data processing system may determine an annual lost energy yield of the faulty module based on the first power generation data, the second power generation data, and a preset energy yield of the photovoltaic power station, and obtain a target operation and maintenance measure from a plurality of operation and maintenance measures based on the annual lost energy yield. In this case, a communication system in the power station operation and maintenance system may notify an operation and maintenance user of the photovoltaic power station to perform operation and maintenance on the faulty module.

公开(公告)号：US20220352849A1

公开(公告)日：2022-11-03

申请号：US17868105

申请日：2022-07-19

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianqiang WANG ,  Yuandong MENG ,  Song WAN ,  Yanzhong ZHANG

IPC: H02S50/15 ,  H02J3/00 ,  G06T7/00

Abstract: A photovoltaic string location update method and apparatus includes: obtaining, based on a physical map, a physical location of a first photovoltaic string corresponding to a first logical location in the physical map, the physical map indicating a correspondence between a logical location of a photovoltaic string and a physical location of the photovoltaic string, and the photovoltaic string includes the first photovoltaic string; and when the physical location of the first photovoltaic string in the physical map is different from a first actual physical location of the first photovoltaic string, updating the physical location of the photovoltaic string in the physical map to the first actual physical location, to obtain an updated physical map. The first actual physical location of the photovoltaic string is inconsistent with the physical location in the physical map, to prepare for subsequent operation and maintenance accurately performed on the photovoltaic string.

公开(公告)号：US20220166377A1

公开(公告)日：2022-05-26

申请号：US17669724

申请日：2022-02-11

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianqiang WANG ,  Song WAN ,  Yanzhong ZHANG ,  Yongbing GAO

IPC: H02S50/15 ,  H04N5/33 ,  H02S40/32

Abstract: This application discloses a method and an apparatus for detecting a solar cell of a photovoltaic plant. The method includes: obtaining a first infrared image and a second infrared image, where the first infrared image includes infrared image information corresponding to an ambient infrared signal reflected by a to-be-detected solar cell operating in a short-circuit state, the second infrared image includes infrared image information corresponding to an infrared signal emitted by the to-be-detected solar cell operating in a first state and infrared image information corresponding to an ambient infrared signal reflected by the to-be-detected solar cell, and the first state is another state other than the short-circuit state; and detecting, based on the first infrared image and the second infrared image, whether the to-be-detected solar cell has a defect.